This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer is designing a highly available VPN connectivity between an on-premises data center and AWS. The company has two AWS Direct Connect connections terminated on two different AWS Direct Connect locations for redundancy. The company wants to use AWS Site-to-Site VPN as a backup for Direct Connect. The VPN connections will terminate on a single Virtual Private Gateway (VGW) attached to a VPC. The on-premises network has two customer gateways (CGWs) each with a unique BGP ASN. Which TWO actions should the engineer take to ensure automatic failover and load balancing? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the VPN connections to use BGP dynamic routing.
Option A is correct because using BGP dynamic routing on both VPN tunnels allows automatic failover and load balancing. Option C is correct because creating a VPN connection from each CGW to the same VGW provides two separate tunnels. Option B is incorrect because static routes do not provide automatic failover. Option D is incorrect because a single CGW creates a single point of failure. Option E is incorrect because the VPN is backup; using BGP on both tunnels handles failover without cloudwatch alarms.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure the VPN connections to use BGP dynamic routing.
Why this is correct
BGP allows automatic route propagation and failover.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set up a CloudWatch alarm to trigger an AWS Lambda function that changes route table entries upon VPN failure.
Configure the VPN connections to use static routes with equal cost multipath (ECMP).
Why it's wrong here
Static routes do not provide automatic failover detection.
✗
Use a single customer gateway with two separate tunnels to the virtual private gateway.
Why it's wrong here
Single CGW is a single point of failure.
✓
Create two VPN connections, each from a different customer gateway to the same virtual private gateway.
Why this is correct
Two separate tunnels from different CGWs provide redundancy.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure the VPN connections to use BGP dynamic routing. — Option A is correct because using BGP dynamic routing on both VPN tunnels allows automatic failover and load balancing. Option C is correct because creating a VPN connection from each CGW to the same VGW provides two separate tunnels. Option B is incorrect because static routes do not provide automatic failover. Option D is incorrect because a single CGW creates a single point of failure. Option E is incorrect because the VPN is backup; using BGP on both tunnels handles failover without cloudwatch alarms.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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